Two. They're pretty militant about limiting purchases to members only. If you have a friend or family member who doesn't have a membership with you and they want to get some items, you have to pay for the items and get them to reimburse you; Costco won't let them pay, even with cash.
2 people per family, but if your friend needs something as long as you go with them they can just kind've piggy back off of your card. There are three different cards standard, gold, and business. I think it's a 110 for the gold for one whole year, and me and my dad split it, so if ever he is at work and my mom needs something from there I just take her. And they take the picture of the card holders.
2 per account
2 people in same household
Only yourself and one other
Husband and spouse or child... unless you have a business membership
Only 2
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